...and 3% hydrogen peroxide from the drugstore? What ratio, and will it work at room temperature?
If cheap 3% peroxide is not strong enough, what about ammonium nitrate or potasium nitrate in dilute muriatic (hydrochloric) acid? That should be functionally equivalent to dilute nitric acid.
I'm looking for something easy to get and less messy than ferric chloride, and I don't even know where to find ammonium persulfate.
Thanks, and best regards, Bob